cf5289c553
This isn't complete yet, but subsequent steps will depend on Rust libstd and libc bindings changes that are in flight.
141 lines
3.8 KiB
Rust
141 lines
3.8 KiB
Rust
use crate::{
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file::FileType,
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sys::dir::{iter_impl, EntryImpl},
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};
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use std::convert::TryInto;
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use std::io::{Error, Result};
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#[cfg(unix)]
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use std::os::unix::io::{AsRawFd, IntoRawFd, RawFd};
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#[cfg(target_os = "wasi")]
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use std::os::wasi::io::{AsRawFd, IntoRawFd, RawFd};
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use std::{ffi::CStr, io, ops::Deref, ptr};
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pub use crate::sys::EntryExt;
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#[derive(Clone, Debug, Eq, Hash, PartialEq)]
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pub struct Dir(ptr::NonNull<libc::DIR>);
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impl Dir {
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/// Takes the ownership of the passed-in descriptor-based object,
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/// and creates a new instance of `Dir`.
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#[inline]
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pub fn from<F: IntoRawFd>(fd: F) -> Result<Self> {
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let fd = fd.into_raw_fd();
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unsafe { Self::from_fd(fd) }
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}
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unsafe fn from_fd(fd: RawFd) -> Result<Self> {
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let d = libc::fdopendir(fd);
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if let Some(d) = ptr::NonNull::new(d) {
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Ok(Self(d))
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} else {
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let e = io::Error::last_os_error();
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libc::close(fd);
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Err(e.into())
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}
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}
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/// Set the position of the directory stream, see `seekdir(3)`.
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#[cfg(not(target_os = "android"))]
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pub fn seek(&mut self, loc: SeekLoc) {
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unsafe { libc::seekdir(self.0.as_ptr(), loc.0) }
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}
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/// Reset directory stream, see `rewinddir(3)`.
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pub fn rewind(&mut self) {
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unsafe { libc::rewinddir(self.0.as_ptr()) }
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}
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/// Get the current position in the directory stream.
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///
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/// If this location is given to `Dir::seek`, the entries up to the previously returned
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/// will be omitted and the iteration will start from the currently pending directory entry.
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#[cfg(not(target_os = "android"))]
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#[allow(dead_code)]
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pub fn tell(&self) -> SeekLoc {
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let loc = unsafe { libc::telldir(self.0.as_ptr()) };
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SeekLoc(loc)
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}
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/// For use by platform-specific implementation code. Returns the raw
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/// underlying state.
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pub(crate) fn as_raw(&self) -> ptr::NonNull<libc::DIR> {
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self.0
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}
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}
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unsafe impl Send for Dir {}
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impl AsRawFd for Dir {
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fn as_raw_fd(&self) -> RawFd {
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unsafe { libc::dirfd(self.0.as_ptr()) }
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}
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}
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impl Drop for Dir {
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fn drop(&mut self) {
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unsafe { libc::closedir(self.0.as_ptr()) };
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}
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}
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#[derive(Debug, Copy, Clone)]
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pub struct Entry(pub(crate) EntryImpl);
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impl Entry {
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/// Returns the file name of this directory entry.
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pub fn file_name(&self) -> &CStr {
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unsafe { CStr::from_ptr(self.0.d_name.as_ptr()) }
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}
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/// Returns the type of this directory entry.
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pub fn file_type(&self) -> FileType {
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FileType::from_dirent_d_type(self.0.d_type)
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}
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}
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#[cfg(not(target_os = "android"))]
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#[derive(Clone, Copy, Debug)]
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pub struct SeekLoc(pub(crate) libc::c_long);
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#[cfg(not(target_os = "android"))]
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impl SeekLoc {
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pub fn to_raw(&self) -> i64 {
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self.0.into()
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}
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pub unsafe fn from_raw(loc: i64) -> Result<Self> {
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// The cookie (or `loc`) is an opaque value, and applications aren't supposed to do
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// arithmetic on them or pick their own values or have any awareness of the numeric
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// range of the values. They're just supposed to pass back in the values that we
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// give them. And any value we give them will be convertable back to `long`,
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// because that's the type the OS gives them to us in. So return an `EINVAL`.
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let loc = loc
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.try_into()
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.map_err(|_| Error::from_raw_os_error(libc::EINVAL))?;
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Ok(Self(loc))
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}
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}
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#[derive(Debug)]
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pub struct DirIter<T: Deref<Target = Dir>>(T);
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impl<T> DirIter<T>
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where
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T: Deref<Target = Dir>,
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{
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pub fn new(dir: T) -> Self {
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Self(dir)
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}
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}
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impl<T> Iterator for DirIter<T>
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where
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T: Deref<Target = Dir>,
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{
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type Item = Result<Entry>;
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fn next(&mut self) -> Option<Self::Item> {
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iter_impl(&self.0).map(|x| x.map(Entry))
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}
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}
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